Subject: Re: null modem cable question (i386)
To: None <netbsd-help@netbsd.org>
From: Jukka Salmi <j+nbsd@2004.salmi.ch>
List: netbsd-help
Date: 08/14/2004 17:02:43
Andy Ball --> netbsd-help (2004-08-12 08:36:41 +0000):
> I've seen a few     DB9 DB25                        DB25 DB9
> different           ~~~ ~~~~                        ~~~~ ~~~
> variations on the     3    2  TXD -----\/----- TXD  2    3
> wiring of null-       2    3  RXD <----/\----> RXD  3    2
> modem cables, this
> is how I do mine.     7    4  RTS -----\/----- RTS  4    7
>                       8    5  CTS <----/\----> CTS  5    8
> Are you able to
> check how your        4   20  DTR -----\/----- DTR  20   4
> cables are wired?     6    6  DSR <-+--/\--+-> DSR  6    6
> I'm guessing that     1    8  DCD <-'      `-> DCD  8    1
> there may be a
> subtle difference     5    7  SG  ------------  SG  7    5
> between them.
> 
> Out of interest, what happens if you reverse the cable that
> seems to work one way?

For both cables it doesn't matter which way I use them, always
the same results. I really should check how they are wired...


Cheers, Jukka

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